CN114367665B - Connection method of CuW alloy and CuCrZr alloy - Google Patents
Connection method of CuW alloy and CuCrZr alloy Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 142
- 239000000956 alloy Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 32
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000005245 sintering Methods 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 17
- 239000010937 tungsten Substances 0.000 claims abstract description 17
- 230000008595 infiltration Effects 0.000 claims abstract description 14
- 238000001764 infiltration Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 12
- 239000010439 graphite Substances 0.000 claims abstract description 12
- 239000006104 solid solution Substances 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 47
- 239000001257 hydrogen Substances 0.000 claims description 17
- 229910052739 hydrogen Inorganic materials 0.000 claims description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 13
- 230000032683 aging Effects 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 abstract 1
- 238000003754 machining Methods 0.000 description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 239000004744 fabric Substances 0.000 description 5
- 150000002431 hydrogen Chemical class 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/04—Casting by dipping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
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- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
- B22F3/101—Changing atmosphere
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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- B22F2003/248—Thermal after-treatment
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Abstract
The invention discloses a connection method of a CuW alloy and a CuCrZr alloy, which comprises the following specific steps: cold pressing a certain amount of tungsten powder into a blank, sintering, cooling along with a furnace to obtain a sintered tungsten block, placing a CuCrZr alloy block above the tungsten block, and then placing the tungsten block in a vacuum furnace for infiltration to obtain an infiltrated CuW alloy; the surface to be connected of the CuW and the CuCrZr alloy is processed and cleaned, the CuW alloy is placed above the CuCrZr alloy and placed in a graphite crucible in an atmosphere vacuum dual-purpose sintering furnace, the connection of the CuW alloy and the CuCrZr alloy is realized by a two-step sintering method, the CuW/CuCrZr integral alloy block is obtained, and then solid solution and time-efficient treatment are carried out, thus obtaining the composite materialTo the connected CuW/CuCrZr alloy. Solves the problem that ZrO exists in the CuW/CuCrZr interface in the prior art in the connecting process 2 Inclusion leads to problems of low interfacial bonding strength.
Description
Technical Field
The invention belongs to the technical field of integral contact alloy connection methods, and relates to a connection method of a CuW alloy and a CuCrZr alloy.
Background
The electrical contacts are contact elements of the electrical switch and are mainly responsible for the task of breaking the load current. Contacts and arc extinguishing systems are the core of the switch and play a vital role in circuit protection. The safety, reliability and switching characteristics of the switch are largely dependent on the physical properties of the contact material. Most of the existing electrical contacts are CuW/CuCr integral contacts, but with the increase of the capacity of a power grid, the heat generated when the contacts are opened and closed is increased sharply, and the requirement on the high temperature performance of CuCr alloy on the CuW/CuCr integral contacts is also increasing more and more severely. The CuCrZr alloy becomes the material choice of the conductive section of the next generation integral contact because of the high temperature performance of the CuCrZr alloy which is obviously superior to that of the CuCr alloy. However, zr has extremely strong affinity to oxygen, and the CuW/CuCrZr interface is extremely easy to generate ZrO in the connection process 2 Inclusion results in low interfacial bond strength.
Disclosure of Invention
The invention aims to provide a connecting method of a CuW alloy and a CuCrZr alloy, which solves the problem that ZrO exists in the connecting process of a CuW/CuCrZr interface in the prior art 2 Inclusion leads to problems of low interfacial bonding strength.
The technical scheme adopted by the invention is that the method for connecting the CuW alloy and the CuCrZr alloy is implemented according to the following steps:
cold pressing a certain amount of tungsten powder into a blank, sintering at 1200-1400 ℃, preserving heat for 2-6 h, cooling along with a furnace to obtain a sintered tungsten block, placing a certain amount of CuCrZr alloy block above the sintered tungsten block, then placing the tungsten block in a vacuum furnace for infiltration at 1200-1450 ℃, preserving heat for 2-6 h, and cooling along with the furnace to obtain the infiltrated CuW alloy;
step two, processing and cleaning the surface to be connected of the CuW and the CuCrZr alloy, placing the CuW alloy above the CuCrZr alloy, placing the CuW alloy in a graphite crucible in an atmosphere vacuum dual-purpose sintering furnace, and realizing the connection of the CuW alloy and the CuCrZr alloy by a two-step sintering method to obtain a CuW/CuCrZr integral alloy block;
and thirdly, carrying out solid solution and time-efficient treatment on the CuW/CuCrZr integral alloy block obtained in the second step to obtain the connected CuW/CuCrZr alloy.
The present invention is also characterized in that,
the weight percentage of W in the CuW alloy obtained in the step one is 20-40 wt%.
In the second step, the weight percentage of Cr in the CuCrZr alloy is 0.05-1.0 wt%, and the weight percentage of Zr is 0.05-1.0 wt%.
In the second step, the selection principle of the CuCrZr alloy counterweight sample block is as follows: according to the contact area of the CuCrZr counterweight sample block and the CuW, the pressure of the CuCrZr counterweight to the CuW sample block is ensured to be within the range of 0.5-1 MPa.
The two-step sintering method in the second step comprises the following steps: heating the graphite crucible in an atmosphere vacuum dual-purpose sintering furnace from room temperature to 900-1100 ℃ in a hydrogen atmosphere at a heating rate of 3-10 ℃/min; stopping introducing hydrogen when the temperature reaches 900-1100 ℃, starting vacuumizing, and maintaining at the temperature until the vacuum degree is increased to 10 -3 Pa, continuously heating to 1300-1450 ℃ at 5-7 ℃/min, and then preserving heat for 2-6 h.
In the third step, the solid solution temperature is 800-1200 ℃ and the time is 1-3 h.
And in the third step, the aging temperature is 200-600 ℃ and the time is 2-6 h.
The beneficial effects of the invention are as follows:
the method adopts a two-step sintering method, and adopts hydrogen reducing atmosphere to reduce and purify CuW and CuCrZr alloy in the first section; the second section adopts high vacuum to ensure that the CuCrZr alloy and the connecting interface are not oxidized, and Cr and Zr elements can diffuse into the CuW matrix, so that the metallurgical combination of the CuW alloy and the CuCrZr alloy is realized, and the CuW/CuCrZr integral contact with high interface bonding force is obtained.
After the third heat treatment in the step of the invention, the connection strength of the CuW/CuCrZr interface is not less than 320MPa.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention discloses a connecting method of a CuW alloy and a CuCrZr alloy, which is implemented according to the following steps:
firstly, cold pressing a certain amount of tungsten powder into a blank, sintering at 1200-1400 ℃, preserving heat for 2-6 h, cooling along with a furnace to obtain a sintered tungsten block, placing a certain amount of CuCrZr alloy block above the sintered tungsten block, then placing the tungsten block in a vacuum furnace for infiltration at 1200-1450 ℃, preserving heat for 2-6 h, and cooling along with the furnace to obtain the infiltrated CuW alloy, wherein the weight percentage of W in the CuW alloy is 20-40%wt;
step two, processing and cleaning the surface to be connected of the CuW and the CuCrZr alloy, placing the CuW alloy above the CuCrZr alloy, placing the CuW alloy in a graphite crucible in an atmosphere vacuum dual-purpose sintering furnace, and realizing the connection of the CuW alloy and the CuCrZr alloy by a two-step sintering method, wherein the method specifically comprises the following steps of: heating the graphite crucible in an atmosphere vacuum dual-purpose sintering furnace from room temperature to 900-1100 ℃ in a hydrogen atmosphere at a heating rate of 3-10 ℃/min; stopping introducing hydrogen when the temperature reaches 900-1100 ℃, starting vacuumizing, and maintaining at the temperature until the vacuum degree is increased to 10 -3 Pa, continuously heating to 1300-1450 ℃ at 5-7 ℃/min, and then preserving heat for 2-6 hours to obtain a CuW/CuCrZr integral alloy block; wherein, the weight percentage of Cr in the CuCrZr alloy is 0.05 to 1.0 percent by weight, and the weight percentage of Zr is 0.05 to 1.0 percent by weight; the selection principle of the CuCrZr alloy counterweight sample block is as follows: according to the contact area of the CuCrZr counterweight sample block and the CuW, ensuring that the pressure of the CuCrZr counterweight to the CuW sample block is within the range of 0.5-1 MPa;
and thirdly, carrying out solid solution and aging treatment on the CuW/CuCrZr integral alloy block obtained in the second step, wherein the solid solution temperature is 800-1200 ℃, the time is 1-3 h, the aging temperature is 200-600 ℃, and the time is 2-6 h, so as to obtain the connected CuW/CuCrZr alloy.
Embodiment one:
CuW alloy and CuCrZThe connection method of the r alloy specifically comprises the following steps: cold pressing a certain amount of tungsten powder into a blank, sintering at 1300 ℃, preserving heat for 3 hours, and beginning infiltration after cooling along with a furnace. And (3) placing a certain amount of CuCrZr alloy blocks above the sintered tungsten blocks, then placing the blocks in a vacuum furnace for infiltration at 1200 ℃, preserving heat for 2 hours, and then cooling the blocks along with the furnace to obtain the infiltrated CuW alloy. Then processing the CuW alloy and the CuCrZr alloy into test blocks with certain size, machining and cutting off the surface oxide layer of the CuW alloy, and then using 100 # The surface of the CuCrZr alloy sample block is polished by a grinding wheel, and then soft cloth or paper is stuck with alcohol to clean oil stains on the surface. Placing a CuW alloy sample block below the CuCrZr sample block, and placing a CuCrZr counterweight sample block above the CuCrZr alloy sample block for counterweight; and according to the contact area of the CuCrZr counterweight sample block and the CuW, the pressure of the CuCrZr counterweight to the CuW sample block is 0.5MPa. And (3) putting the test pieces into a graphite mold together in sequence, putting the test pieces into a vacuum furnace, heating the test pieces in two sections, and introducing hydrogen when heating at the temperature of between room temperature and 900 ℃ at the heating rate of 7 ℃/min. When the temperature reaches 900 ℃, stopping introducing hydrogen, rapidly operating the vacuum system to start vacuumizing, and preserving heat for a certain time until the vacuum degree is increased to 10 -3 Above pa, maintaining the vacuum degree, heating to 1350 ℃, heating at a speed of 5 ℃/min, preserving heat for 3h, and cooling with a furnace. Finally, the obtained pattern is subjected to heat treatment, the connection strength of the CuW/CuCrZr interface after heat treatment is 340.7MPa, and the specific parameters are as follows: the solid solution temperature is 900 ℃ and the time is 2 hours. The aging temperature is 300 ℃ and the time is 4 hours. And (5) carrying out subsequent machining to obtain the CuW/CuCrZr alloy contact.
Embodiment two:
a connection method of CuW alloy and CuCrZr alloy comprises the following specific steps: cold pressing a certain amount of tungsten powder into a blank, sintering at 1200 ℃, preserving heat for 2 hours, and beginning infiltration after cooling along with a furnace. And (3) placing a certain amount of CuCrZr alloy blocks above the sintered tungsten blocks, then placing the blocks in a vacuum furnace for infiltration at 1250 ℃, preserving heat for 2 hours, and then cooling the blocks along with the furnace to obtain the infiltrated CuW alloy. Then processing the CuW alloy and the CuCrZr alloy into test blocks with certain size, machining and cutting off the surface oxide layer of the CuW alloy, and then using 100 # Grinding the surface of the CuCrZr alloy sample block by using a grinding wheel, and thenThe soft cloth or paper is stuck with alcohol to clean the greasy dirt on the surface. Placing a CuW alloy sample block below the CuCrZr sample block, and placing a CuCrZr counterweight sample block above the CuCrZr alloy sample block for counterweight; and according to the contact area of the CuCrZr counterweight sample block and the CuW, the pressure of the CuCrZr counterweight to the CuW sample block is 0.5MPa. And (3) putting the test pieces into a graphite mold together in sequence, putting the test pieces into a vacuum furnace, heating the test pieces in two sections, and introducing hydrogen when heating at the temperature of between room temperature and 900 ℃ at the heating rate of 4 ℃/min. When the temperature reaches 900 ℃, stopping introducing hydrogen, rapidly operating the vacuum system to start vacuumizing, and preserving heat for a certain time until the vacuum degree is increased to 10 -3 Above pa, maintaining the vacuum degree, heating to 1350 ℃, heating at a speed of 6 ℃/min, preserving heat for 3h, and cooling with a furnace. Finally, the obtained pattern is subjected to heat treatment, the connection strength of the CuW/CuCrZr interface after heat treatment is 339.6MPa, and the specific parameters are as follows: the solid solution temperature is 900 ℃ and the time is 1h. The aging temperature is 300 ℃ and the time is 2 hours. And (5) carrying out subsequent machining to obtain the CuW/CuCrZr alloy contact.
Embodiment III:
a connection method of CuW alloy and CuCrZr alloy comprises the following specific steps: cold pressing a certain amount of tungsten powder into a blank, sintering at 1300 ℃, preserving heat for 4 hours, and beginning infiltration after cooling along with a furnace. And (3) placing a certain amount of CuCrZr alloy blocks above the sintered tungsten blocks, then placing the blocks in a vacuum furnace for infiltration at 1350 ℃, preserving heat for 4 hours, and then cooling the blocks along with the furnace to obtain the infiltrated CuW alloy. Then processing the CuW alloy and the CuCrZr alloy into test blocks with certain size, machining and cutting off the surface oxide layer of the CuW alloy, and then using 100 # The surface of the CuCrZr alloy sample block is polished by a grinding wheel, and then soft cloth or paper is stuck with alcohol to clean oil stains on the surface. Placing a CuW alloy sample block below the CuCrZr sample block, and placing a CuCrZr counterweight sample block above the CuCrZr alloy sample block for counterweight; and according to the contact area of the CuCrZr counterweight sample block and the CuW, the pressure of the CuCrZr counterweight to the CuW sample block is 0.8MPa. And (3) putting the test pieces into a graphite mold together in sequence, putting the test pieces into a vacuum furnace, heating the test pieces in two sections, and introducing hydrogen when heating at the temperature of between room temperature and 900 ℃ at the heating rate of 7 ℃/min. When the temperature reaches 900 ℃, stopping introducing hydrogen and rapidly transportingThe vacuum pumping system starts to vacuumize, and the temperature is kept for a certain time until the vacuum degree rises to 10 -3 Above pa, maintaining the vacuum degree, heating to 1300 ℃, heating at a heating rate of 5 ℃/min, preserving heat for 3h, and cooling along with a furnace. Finally, the obtained pattern is subjected to heat treatment, the connection strength of the CuW/CuCrZr interface after heat treatment is 358.9MPa, and the specific parameters are as follows: the solid solution temperature is 1000 ℃ and the time is 1h. The aging temperature is 600 ℃ and the time is 5 hours. And (5) carrying out subsequent machining to obtain the CuW/CuCrZr alloy contact.
Embodiment four:
a connection method of CuW alloy and CuCrZr alloy comprises the following specific steps: cold pressing a certain amount of tungsten powder into a blank, sintering at 1400 ℃, preserving heat for 6 hours, and beginning infiltration after cooling along with a furnace. And (3) placing a certain amount of CuCrZr alloy blocks above the sintered tungsten blocks, then placing the blocks in a vacuum furnace for infiltration at 1450 ℃, preserving heat for 6 hours, and cooling the blocks along with the furnace to obtain the infiltrated CuW alloy. Then processing the CuW alloy and the CuCrZr alloy into test blocks with certain size, machining and cutting off the surface oxide layer of the CuW alloy, and then using 100 # The surface of the CuCrZr alloy sample block is polished by a grinding wheel, and then soft cloth or paper is stuck with alcohol to clean oil stains on the surface. Placing a CuW alloy sample block below the CuCrZr sample block, and placing a CuCrZr counterweight sample block above the CuCrZr alloy sample block for counterweight; and according to the contact area of the CuCrZr counterweight sample block and the CuW, the pressure of the CuCrZr counterweight to the CuW sample block is 1.0MPa. And (3) putting the test pieces into a graphite mold together in sequence, putting the test pieces into a vacuum furnace, heating the test pieces in two sections, and introducing hydrogen when heating at the temperature of between room temperature and 900 ℃ at the heating rate of 8 ℃/min. When the temperature reaches 900 ℃, stopping introducing hydrogen, rapidly operating the vacuum system to start vacuumizing, and preserving heat for a certain time until the vacuum degree is increased to 10 -3 Above pa, maintaining the vacuum degree, heating to 1350 ℃, heating at a speed of 7 ℃/min, preserving heat for 3h, and cooling with a furnace. Finally, the obtained pattern is subjected to heat treatment, the connection strength of the CuW/CuCrZr interface after heat treatment is 355.4MPa, and the specific parameters are as follows: the solid solution temperature is 1200 ℃ and the time is 3h. The aging temperature is 300 ℃ and the time is 4 hours. And (5) carrying out subsequent machining to obtain the CuW/CuCrZr alloy contact.
Fifth embodiment:
a connection method of CuW alloy and CuCrZr alloy comprises the following specific steps: cold pressing a certain amount of tungsten powder into a blank, sintering at 1400 ℃, preserving heat for 3 hours, and beginning infiltration after cooling along with a furnace. And (3) placing a certain amount of CuCrZr alloy blocks above the sintered tungsten blocks, then placing the blocks in a vacuum furnace for infiltration at 1450 ℃, preserving heat for 2 hours, and cooling the blocks along with the furnace to obtain the infiltrated CuW alloy. Then processing the CuW alloy and the CuCrZr alloy into test blocks with certain size, machining and cutting off the surface oxide layer of the CuW alloy, and then using 100 # The surface of the CuCrZr alloy sample block is polished by a grinding wheel, and then soft cloth or paper is stuck with alcohol to clean oil stains on the surface. Placing a CuW alloy sample block below the CuCrZr sample block, and placing a CuCrZr counterweight sample block above the CuCrZr alloy sample block for counterweight; and according to the contact area of the CuCrZr counterweight sample block and the CuW, the pressure of the CuCrZr counterweight to the CuW sample block is 0.8MPa. And (3) putting the test pieces into a graphite mold together in sequence, putting the test pieces into a vacuum furnace, heating the test pieces in two sections, and introducing hydrogen when heating at the temperature of between room temperature and 900 ℃ at the heating rate of 7 ℃/min. When the temperature reaches 900 ℃, stopping introducing hydrogen, rapidly operating the vacuum system to start vacuumizing, and preserving heat for a certain time until the vacuum degree is increased to 10 -3 Above pa, maintaining the vacuum degree, heating to 1400 ℃, heating at a heating rate of 5 ℃/min, preserving heat for 3h, and cooling with a furnace. Finally, the obtained pattern is subjected to heat treatment, the connection strength of the CuW/CuCrZr interface after heat treatment is 348.6MPa, and the specific parameters are as follows: the solid solution temperature is 1200 ℃ and the time is 2 hours. The aging temperature is 600 ℃ and the time is 6 hours. And (5) carrying out subsequent machining to obtain the CuW/CuCrZr alloy contact.
The bonding interface of the CuW/CuCrZr integral alloy block generated by the method has no obvious cracks, pores and inclusions, and no segregation, oxidation and intermetallic compound generation of Cr and Zr elements.
Claims (6)
1. The connecting method of the CuW alloy and the CuCrZr alloy is characterized by comprising the following steps:
cold pressing a certain amount of tungsten powder into a blank, sintering at 1200-1400 ℃, preserving heat for 2-6 h, cooling along with a furnace to obtain a sintered tungsten block, placing a certain amount of CuCrZr alloy block above the sintered tungsten block, then placing the tungsten block in a vacuum furnace for infiltration at 1200-1450 ℃, preserving heat for 2-6 h, and cooling along with the furnace to obtain the infiltrated CuW alloy;
step two, processing and cleaning the surface to be connected of the CuW and the CuCrZr alloy, placing the CuW alloy above the CuCrZr alloy, placing the CuW alloy in a graphite crucible in an atmosphere vacuum dual-purpose sintering furnace, and realizing the connection of the CuW alloy and the CuCrZr alloy by a two-step sintering method to obtain a CuW/CuCrZr integral alloy block; the two-step sintering method comprises the following steps: heating the graphite crucible in an atmosphere vacuum dual-purpose sintering furnace from room temperature to 900-1100 ℃ in a hydrogen atmosphere at a heating rate of 3-10 ℃/min; stopping introducing hydrogen when the temperature reaches 900-1100 ℃, starting vacuumizing, and maintaining at the temperature until the vacuum degree is increased to 10 -3 Pa, continuously heating to 1300-1450 ℃ at 5-7 ℃/min, and then preserving heat for 2-6 h;
and thirdly, carrying out solid solution and time-efficient treatment on the CuW/CuCrZr integral alloy block obtained in the second step to obtain the connected CuW/CuCrZr alloy.
2. The method for connecting a CuW alloy and a CuCrZr alloy according to claim 1, wherein the weight percentage of W in the CuW alloy obtained in the first step is 20% -40% wt.
3. The method for connecting a CuW alloy and a CuCrZr alloy according to claim 2, wherein in the second step, the weight percentage of Cr in the CuCrZr alloy is 0.05-1.0 wt% and the weight percentage of Zr is 0.05-1.0 wt%.
4. The method for connecting a CuW alloy and a CuCrZr alloy according to claim 3, wherein the selection principle of the CuCrZr alloy counterweight sample block in the second step is as follows: according to the contact area of the CuCrZr counterweight sample block and the CuW, the pressure of the CuCrZr counterweight to the CuW sample block is ensured to be within the range of 0.5-1 MPa.
5. The method for connecting a CuW alloy and a CuCrZr alloy according to claim 4, wherein the solid solution temperature in the third step is 800-1200 ℃ for 1-3 h.
6. The method for connecting a CuW alloy and a CuCrZr alloy according to claim 4, wherein the aging temperature in the third step is 200-600 ℃ for 2-6 h.
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